modify OSS-Fuzz build script

[AdamKorcz]

Signed-off-by: AdamKorcz adam@adalogics.com

Summary

1. Pull github.com/AdamKorcz/go-118-fuzz-build/testing instead of /utils due to OSS-Fuzz infra changes.
2. Build alpine fuzzer.

Release Note

Documentation

[codecov-commenter]

Codecov Report

Merging #1214 (3661fe1) into main (bd1452b) will decrease coverage by 15.36%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #1214       +/-   ##
===========================================
- Coverage   64.22%   48.85%   -15.37%     
===========================================
  Files          82       82               
  Lines        7628     7628               
===========================================
- Hits         4899     3727     -1172     
- Misses       2100     3198     +1098     
- Partials      629      703       +74     

Flag	Coverage Δ
e2etests	48.85% <ø> (ø)
unittests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/util/timestamp_note.go	0.00% <0.00%> (-76.48%)	⬇️
pkg/types/cose/cose.go	25.92% <0.00%> (-74.08%)	⬇️
pkg/signer/file.go	0.00% <0.00%> (-70.00%)	⬇️
pkg/pki/ssh/sign.go	0.00% <0.00%> (-65.12%)	⬇️
pkg/sharding/log_index.go	38.88% <0.00%> (-55.56%)	⬇️
pkg/types/intoto/v0.0.1/entry.go	17.64% <0.00%> (-53.85%)	⬇️
pkg/types/cose/v0.0.1/entry.go	0.44% <0.00%> (-53.54%)	⬇️
pkg/util/sha.go	46.66% <0.00%> (-53.34%)	⬇️
pkg/types/helm/v0.0.1/entry.go	0.42% <0.00%> (-47.06%)	⬇️
pkg/sharding/ranges.go	21.84% <0.00%> (-42.86%)	⬇️
... and 29 more

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